What are Pure Components in React?

In React, pure components are a type of component that only re-renders when its props have changed. They are a performance optimization feature in React that can help improve the overall performance of your application.

When a pure component receives new props, React performs a shallow comparison of the new and old props. If they are different, the component will re-render. If they are the same, the component will not re-render, which can save on unnecessary re-renders and improve performance.

To create a pure component in React, you can use the React.PureComponent class or you can extend your component from React.PureComponent instead of React.Component.

Pure components are especially useful in scenarios where a component’s props are frequently changing but the component’s output stays the same. By using pure components, you can prevent unnecessary renders and improve the efficiency of your React application.

It’s important to note that pure components only perform a shallow comparison of props, so if your props contain nested objects or arrays, you may need to handle the comparison manually to ensure that the component re-renders when needed.

In summary, pure components in React are a performance optimization feature that can help reduce unnecessary renders and improve the overall performance of your React application. They can be especially useful in scenarios where a component’s props are frequently changing but the component’s output remains the same.